What's the state of the module to interface with (relational) databases?
Not that I know of. Several people have created some interfaces, but they are not compatible.
Steve Teale began some work, but nobody has heard from him in a long time. DDBI for D1 was probably the best effort so far.See http://prowiki.org/wiki4d/wiki.cgi?DatabaseBindings for (seemingly) up to date information on different bindings.
